At first glance, business strategy, film tie-ins and erotica might look like odd bedfellows. Not, however, in the embryonic world of e-books, where they reign as the undisputed kings of the digital download. The list is dominated by the memoirs of one of the most famous CEOs of all time, Jack Welch. Under Welch's iron hand General Electric became the most successful company in the world. Its empire now spans everything from jet engines and locomotives to the absurdly popular Friends and ER (through NBC, which it owns). The way Welch managed GE was rather less popular: he ruthlessly sacked the worst 10% of his staff every year. While it's encouraging that British managers are clearly downloading in the hope of emulating Welch's success, one might have to worry if they start copying his methods. To be on the safe side, it's probably best to take precautionary measures and download the second most popular e-book this week: Max Eggert's The Perfect CV.